continue the discussion on climate science now with james hanson, head of the nasa institute for space studies and author of "storms of my grandchildren." he was awarded an award named for the scientist who advised seven u.s. presidents. this is about an hour and 15 minutes. [applause] >> i interview a lot of fantastic people in this room and that does not happen very often. in 1988, nasa scientist james hansen told a congressional hearing that it was 99% certain that burning fossil fuels was heating the earth's atmosphere. the next day, a new york times headline proclaimed a "global warming has begun." decades later, dr. hansen and others are still trying to convince the united states of these basic observations. about half of american now accept the fact. 40% do not. over the next hour, we will discuss clients -- climate science and public opinion with james hansen. today, dr. hansen is receiving [applause] i've interviewed a lot of fantastic people in this room and that doesn't happen very often. welcome to climate one, a conversation about america's energy, economy and environment.